Computer Science
Multiple Choice
Questions
(MCQs) – Sets 16
with Detailed Explanations
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SET 16 – Computer Science MCQs
✅ No repetition from Sets 1–15
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is an algorithm?
A. A computer device
B. A programming language
C. A step-by-step solution to a problem
D. A type of software
✅ Correct Answer: C
Explanation:
An algorithm is a clear, step-by-step procedure used to solve a problem or perform a task. Algorithms are written before coding to plan logic and improve accuracy. They help programmers understand the problem, reduce errors, and create efficient programs. Algorithms are used in everyday tasks and computer applications.
2. What is a flowchart symbol for decision-making?
A. Oval
B. Rectangle
C. Diamond
D. Circle
✅ Correct Answer: C
Explanation:
In a flowchart, a diamond symbol represents a decision point where a condition is checked. Based on the result (Yes/No or True/False), the flow follows different paths. Decision symbols help visualize logical choices in algorithms and make program flow easier to understand.
3. What is data redundancy?
A. Data security
B. Repetition of the same data
C. Data compression
D. Data validation
✅ Correct Answer: B
Explanation:
Data redundancy occurs when the same data is stored in multiple places unnecessarily. While some redundancy is used for backup, excessive redundancy wastes storage space and can cause inconsistency. Reducing redundancy improves data efficiency and accuracy, especially in database management systems.
4. What is an example of open-source software?
A. Microsoft Word
B. Adobe Photoshop
C. Linux
D. Windows OS
✅ Correct Answer: C
Explanation:
Open-source software is software whose source code is freely available for users to view, modify, and distribute. Linux is a popular example used in servers and personal computers. Open-source software encourages collaboration, learning, and innovation while often being free of cost.
5. What is the purpose of encryption?
A. Speed up computers
B. Hide data from unauthorized users
C. Delete information
D. Compress files
✅ Correct Answer: B
Explanation:
Encryption converts readable data into coded form to protect it from unauthorized access. Only authorized users with a key can decrypt the data. Encryption is widely used in online banking, messaging apps, and data storage to ensure privacy and security of sensitive information.
6. What is a firewall?
A. Antivirus software
B. A hardware device only
C. A security system that monitors network traffic
D. An input device
✅ Correct Answer: C
Explanation:
A firewall is a security system that monitors and controls incoming and outgoing network traffic based on security rules. It helps protect computers and networks from unauthorized access and cyber threats. Firewalls can be hardware-based, software-based, or both, and are essential for cybersecurity.
7. What is an input device?
A. Displays output
B. Stores data
C. Sends data to the computer
D. Processes information
✅ Correct Answer: C
Explanation:
An input device is used to enter data and instructions into a computer. Examples include keyboard, mouse, scanner, and microphone. Input devices allow users to interact with the computer system, making it possible to perform tasks, enter information, and control operations.
8. What is output in computing?
A. Raw data
B. Input instructions
C. Processed information produced by a computer
D. Software error
✅ Correct Answer: C
Explanation:
Output is the processed information that a computer produces after processing input data. Examples include text on a screen, printed documents, sound from speakers, or images. Output devices help users understand results and make decisions based on processed information.
9. What is the full form of USB?
A. Universal System Board
B. United Serial Bus
C. Universal Serial Bus
D. Unified Storage Bus
✅ Correct Answer: C
Explanation:
USB stands for Universal Serial Bus. It is a standard interface used to connect devices like keyboards, mice, printers, and flash drives to a computer. USB supports data transfer and power supply, making it one of the most common and convenient connection technologies.
10. What is a backup?
A. Deleting files
B. Compressing data
C. Copy of data stored for safety
D. Virus protection
✅ Correct Answer: C
Explanation:
A backup is an extra copy of important data stored separately to protect against data loss. Backups are useful in case of hardware failure, virus attacks, or accidental deletion. Regular backups ensure data recovery and are essential for personal users and organizations alike.
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